کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8897910 | 1631050 | 2018 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Threshold incomplete factorization constraint preconditioners for saddle-point matrices
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
اعداد جبر و تئوری
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Threshold incomplete factorization constraint preconditioners for saddle-point matrices Threshold incomplete factorization constraint preconditioners for saddle-point matrices](/preview/png/8897910.png)
چکیده انگلیسی
This paper presents a drop-threshold incomplete LD-1LTâ(δ) factorization constraint preconditioner for saddle-point systems using a threshold parameter δ. A transformed saddle-point matrix is partitioned into a block structure with blocks of order 1 and 2 constituting 'a priori pivots'. Based on these pivots an incomplete LD-1LTâ(δ) factorization constraint preconditioner is computed that approaches an exact form as δ approaches zero. We prove that both the exact and incomplete factorizations exist such that the entries of the constraint block remain unaltered in the triangular factors. Numerical results are presented for validation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Linear Algebra and its Applications - Volume 545, 15 May 2018, Pages 76-107
Journal: Linear Algebra and its Applications - Volume 545, 15 May 2018, Pages 76-107
نویسندگان
Sangye Lungten, Wil H.A. Schilders, Joseph M.L. Maubach,